package com.itheima.youdianda.controller;

import com.itheima.youdianda.common.R;
import lombok.extern.slf4j.Slf4j;
import org.apache.tomcat.util.http.fileupload.IOUtils;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.UUID;

@RestController
@RequestMapping("/common")
@Slf4j
public class commonController {
    @Value("${YouDianDa.basePath}")
    private String basePath;

    /**
     * 文件上传
     * @param file
     * @return 注意:上传文件中的参数name="file" 所以要求 参数MultiapartFile
     */
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file){
        String originalFilename = file.getOriginalFilename();
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));
        String fileName = UUID.randomUUID().toString() + suffix;
        File dir=new File(basePath);
        if (!dir.exists()){
            dir.mkdirs();
        }
        try {
            file.transferTo(new File(basePath+"\\"+fileName));
        }catch (IOException e){
            e.printStackTrace();
        }
        return R.success(fileName);
    }

    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){
        try{
            FileInputStream fileInputStream = new FileInputStream(new File(basePath  + name));
            response.setHeader("content-disposition","attachment;filename="+name);
            IOUtils.copy(fileInputStream,response.getOutputStream());
        }catch (Exception e) {
            e.printStackTrace();
        }
    }
}
